Gilliam County, OR Climate

Gilliam County, OR has a semi-arid climate with hot summers and cold winters. Summers in this area are typically warm to hot, with temperatures reaching 90 degrees Fahrenheit or higher in the hottest months. Winters are generally cool to cold, with temperatures averaging in the low-30s in January. Rainfall is consistent throughout the year, though it tends to be sporadic and varies significantly from month to month. Snowfall is rare and usually limited to the higher elevations. The annual average temperature for Gilliam County is a mild 58 degrees Fahrenheit.

Gilliam County, Oregon gets 13 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Gilliam County averages 12 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 199 sunny days per year in Gilliam County. The US average is 205 sunny days.

Gilliam County gets some kind of precipitation, on average, 79 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 87 degrees
Winter Low: the January low is 28
Rain: averages 13 inches of rain a year
Snow: averages 12 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Gilliam County is 7.4 (10=best), which means it is more comfortable than most places in Oregon.

9.1 Summer - 5.4 Winter

June, September and August are the most pleasant months in Gilliam County, while December and January are the least comfortable months.

Climate	Gilliam, Oregon	United States
	12.5 in.	38.1 in.
	11.7 in.	27.8 in.
	79.2 days	106.2 days
	199 days	205 days
	86.7°	85.8°
	28.0°	21.7°
	7.4	7
	2.9	4.3
	1940 ft.	2443 ft.

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Gilliam County with an average high temperature of 86.7°, which ranks it as warmer than most places in Oregon. In Gilliam County, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Gilliam County are June, September and August.

In Gilliam County, there are 28.1 days annually when the high temperature is over 90°, which is hotter than most places in Oregon.

December has the coldest nighttime temperatures for Gilliam County with an average of 26.3°. This is colder than most places in Oregon.

In Gilliam County, there are 101.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Oregon.

In Gilliam County, there are 1.3 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Oregon.

Humidity is low in Gilliam County, and some people might find the dryness to be uncomfortable. Days with noticeable humidity are rare throughout the year. A very dry climate can lead to cracked, itchy skin and dry eyes.

December is the wettest month in Gilliam County with 1.7 inches of rain, and the driest month is July with 0.3 inches. The wettest season is Spring with 36% of yearly precipitation and 12% occurs in Autumn, which is the driest season. The annual rainfall of 12.5 inches in Gilliam County means that it is drier than most places in Oregon.

November is the rainiest month in Gilliam County with 10.5 days of rain, and August is the driest month with only 2.3 rainy days. There are 79.2 rainy days annually in Gilliam County, which is less rainy than most places in Oregon. The rainiest season is Spring when it rains 34% of the time and the driest is Autumn with only a 12% chance of a rainy day.

An annual snowfall of 11.7 inches in Gilliam County means that it is snowier than most places in Oregon. December is the snowiest month in Gilliam County with 4.2 inches of snow, and 5 months of the year have significant snowfall.

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